diff -r 3110fb3095a2 Lib/multiprocessing/connection.py
--- a/Lib/multiprocessing/connection.py	Sun Feb 09 13:46:20 2014 +0200
+++ b/Lib/multiprocessing/connection.py	Sun Feb 09 14:16:55 2014 +0200
@@ -401,17 +401,12 @@
         if n > 16384:
             # The payload is large so Nagle's algorithm won't be triggered
             # and we'd better avoid the cost of concatenation.
-            chunks = [header, buf]
-        elif n > 0:
+            self._send(header)
+            self._send(buf)
+        else:
             # Issue # 20540: concatenate before sending, to avoid delays due
             # to Nagle's algorithm on a TCP socket.
-            chunks = [header + buf]
-        else:
-            # This code path is necessary to avoid "broken pipe" errors
-            # when sending a 0-length buffer if the other end closed the pipe.
-            chunks = [header]
-        for chunk in chunks:
-            self._send(chunk)
+            self._send(header + buf)
 
     def _recv_bytes(self, maxsize=None):
         buf = self._recv(4)